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Upgrade notes

Dropped php 5.3 support.

Error code constants in Assertion class are now deprecated and will be removed in 4.0 release. Preferred way is to use constants from Assert\Assertion namespace as follows:

# before 3.0:
\Assert\Assertion::INVALID_JSON_STRING

# 3.0:
\Assert\Assertion\INVALID_JSON_STRING

So you need to replace :: with \ before constant name.

These can be easily done with following regular expression search and replace: search for Assertion::([A-Z_\d]+) and replace with Assertion\\$1.